and the man who shut down the government under bill clinton. what newt gingrich thinks it will take to avoid that happening again. >>> plus one of my personal heroes, the fastest man in the history of planet earth. jamaican sprinter usain bolt revealing a talent you may not know he has. ♪ let's get together and feel all right ♪ >> this is "piers morgan tonight." >>> good evening. our big story tonight, you are so hot, america. i mean that literally. the temperature was a balmy 60 degrees this afternoon in new york just outside cnn's studios. the average high temperature in december is normally 43. a warm front has flooded the lower 48 states. quite extraordinary but is it evidence of man-made global warming? that's tonight's battleground america. joining me now, bill nye the science guy and mark morano, the publisher of climate depo.com. welcome to you both. let me start with you, mark, if i may. you are implacably opposed to the concept of man-made climate change. why? >> we followed the evidence. there are quite literally hundreds of fact